Ritalin day 8 - not working and it sucks

Took the pill at 8. I don't feel it work at all.
ON my first day, I was weakened by the flu and it worked perfectly. I was focused on a task and had no problem with staying on the target for 7 hours.
Since i'm back to healthy, the effect faded into nonexistance

Today I asked to up the dose. No point writing until i get the prescription

See you on next day